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The operator will ask a few general questions, such as “Is there anything else you want to say before the test starts?” She might ask if there is anything you want to add to your answers, or if you were hiding anything from her. The idea is to clear your mind of any small issues prior to the test, and, of course, to get any admissions she can.Try this www.liedetector.uk website to get more
Now you get an explanation of how the polygraph works. She explains that the polygraph tracks physiological responses you have when you are asked a question (and when you answer it). She tells you that they are all “yes” or “no” questions, and may mention that the results are not admissible in court.

There will be no “surprise” questions, you are told. In fact, you will know the questions to be asked before the test, and they will be asked in the same order during the test. This is done on purpose, for better tracking of physiological responses. In this way, you’ll know when a “problem” question is coming, and the polygraph will more accurately measure your response to it–so says the theory of polygraph testing.

She explains that “baseline” questions will be asked at the beginning. These are questions that the operator and you both know, like your name, place of employment, and perhaps a few other simple questions. She tells you that normally your baseline responses rise as you are asked a question, and fall after you answer.

She may go deeper into the process, explaining how knowing that a “problem” question is coming, your baseline will rise during subsequent questions. You will be anticipating it, and then, once it is asked, there will be a more dramatic drop in the baseline upon answering it. This is from the normal release of tension we feel when an anticipated event is over, and this is measured by the polygraph machine.